{
  "abstract": "Europium-doped calcium fluoride (Eu:CaF$_2$) exhibits characteristic blue Eu$^{2+}$ and red Eu$^{3+}$ emissions. In our previous study, the Eu$^{3+}$/Eu$^{2+}$ radioluminescence intensity ratio under $α$-particle irradiation was approximately twice that under X-ray irradiation. Here, we investigate the relationship between this emission ratio and energy-loss density using H, Li, C, and Ni ion beams produced by a tandem accelerator. Radioluminescence spectra were measured for each ion species, and the effective range-averaged energy-loss density was evaluated using SRIM simulations, spanning approximately 18 to 5900~keV/$μ$m. The Eu$^{3+}$/Eu$^{2+}$ emission-intensity ratio increased systematically from H to C ions by approximately a factor of two, whereas no further systematic increase was observed for Ni ions at substantially higher energy-loss densities. Because the energy-loss density was varied mainly by changing the ion species, its effect cannot be fully separated from that of ion-specific track structure. The X-ray result, included for qualitative comparison, showed a lower emission ratio than the ion-beam measurements, although its effective energy-loss density was estimated only approximately. These results demonstrate a systematic variation in the emission color of Eu:CaF$_2$ across different ion-beam irradiation conditions and provide baseline data for future studies of wavelength-resolved particle discrimination.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.36714",
  "author_total": 12,
  "authors": [
    {
      "name": "T. Iida"
    },
    {
      "name": "M. Yoshino"
    },
    {
      "name": "T. Moriguchi"
    },
    {
      "name": "A. Ozawa"
    },
    {
      "name": "S. Sugi"
    },
    {
      "name": "M. Mikawa"
    },
    {
      "name": "M. Mitsui"
    },
    {
      "name": "H. Kobayashi"
    },
    {
      "name": "Y. Saito"
    },
    {
      "name": "R. Iwamoto"
    },
    {
      "name": "K. J. Kim"
    },
    {
      "name": "K. Kamada"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0nh7qjwrrecxy.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.36714",
  "fulltext_url": null,
  "id": "0nh7qjwrrecxy",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.36714",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "openalex",
      "3108|Radiation Detection and Scintillator Technologies"
    ]
  ],
  "openalex": "W7224113701",
  "pdf_url": "https://arxiv.org/pdf/2610.36714",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0nh7qjwrrecxy.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.36714",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.36714"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Particle-dependent radioluminescence color response of Eu-doped CaF$_2$ associated with energy-loss density",
  "title_text": "Particle-dependent radioluminescence color response of Eu-doped CaF_2 associated with energy-loss density",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/0nh7qjwrrecxy",
  "venue": "arXiv",
  "versions": []
}